次の計算の口に入る数字を求めます。 (1) $5 \times 4 + 5 - 3 = 2 \times 9 + \Box \times 2 - 4$ (2) $7 \times \Box - 8 \div 2 = 8 + 6 \div 2 - 1$ (3) $4 \div 2 \times 5 + 8 = \Box \div 3 + 3 \times 5$ (4) $4 \times \Box - 8 \div 4 = 2 + 3 \times 5 - 7$ (5) $8 - 2 \times 2 + 5 = 6 \times \Box - 5 \times 3$ (6) $\Box \div 3 + 2 \times 4 = 7 + 4 \times 2 - 4$ (7) $6 + 9 \div 3 - 3 = 2 \times 5 - \Box \times 2$

はい、承知いたしました。画像の問題を解きます。

1. 問題の内容

次の計算の口に入る数字を求めます。

(1) $5 \times 4 + 5 - 3 = 2 \times 9 + \Box \times 2 - 4$

(2) $7 \times \Box - 8 \div 2 = 8 + 6 \div 2 - 1$

(3) $4 \div 2 \times 5 + 8 = \Box \div 3 + 3 \times 5$

(4) $4 \times \Box - 8 \div 4 = 2 + 3 \times 5 - 7$

(5) $8 - 2 \times 2 + 5 = 6 \times \Box - 5 \times 3$

(6) $\Box \div 3 + 2 \times 4 = 7 + 4 \times 2 - 4$

(7) $6 + 9 \div 3 - 3 = 2 \times 5 - \Box \times 2$

2. 解き方の手順

各問題について、計算の順序（括弧、乗除、加減）に従って計算し、口に入る数字を求めます。

(1) $5 \times 4 + 5 - 3 = 20 + 5 - 3 = 22$

$2 \times 9 + \Box \times 2 - 4 = 18 + \Box \times 2 - 4 = 14 + \Box \times 2$

$22 = 14 + \Box \times 2$

$\Box \times 2 = 8$

$\Box = 4$

(2) $7 \times \Box - 8 \div 2 = 7 \times \Box - 4$

$8 + 6 \div 2 - 1 = 8 + 3 - 1 = 10$

$7 \times \Box - 4 = 10$

$7 \times \Box = 14$

$\Box = 2$

(3) $4 \div 2 \times 5 + 8 = 2 \times 5 + 8 = 10 + 8 = 18$

$\Box \div 3 + 3 \times 5 = \Box \div 3 + 15$

$18 = \Box \div 3 + 15$

$\Box \div 3 = 3$

$\Box = 9$

(4) $4 \times \Box - 8 \div 4 = 4 \times \Box - 2$

$2 + 3 \times 5 - 7 = 2 + 15 - 7 = 10$

$4 \times \Box - 2 = 10$

$4 \times \Box = 12$

$\Box = 3$

(5) $8 - 2 \times 2 + 5 = 8 - 4 + 5 = 9$

$6 \times \Box - 5 \times 3 = 6 \times \Box - 15$

$9 = 6 \times \Box - 15$

$6 \times \Box = 24$

$\Box = 4$

(6) $\Box \div 3 + 2 \times 4 = \Box \div 3 + 8$

$7 + 4 \times 2 - 4 = 7 + 8 - 4 = 11$

$\Box \div 3 + 8 = 11$

$\Box \div 3 = 3$

$\Box = 9$

(7) $6 + 9 \div 3 - 3 = 6 + 3 - 3 = 6$

$2 \times 5 - \Box \times 2 = 10 - \Box \times 2$

$6 = 10 - \Box \times 2$

$\Box \times 2 = 4$

$\Box = 2$

3. 最終的な答え

(1) 4

(2) 2

(3) 9

(4) 3

(5) 4

(6) 9

(7) 2